**Introduction:**

Jaw crushers are commonly used in the mining and construction industries to crush a variety of materials such as rocks, minerals, and ores. A jaw crusher works by compressing the material between two plates, called the jaws. The movable jaw exerts force on the rock by pressing it against the stationary jaw plate. This action crushes the material, allowing it to pass through the opening at the bottom of the crusher. The size of the opening determines the size of the crushed material. In this article, we will discuss the calculations involved in designing a jaw crusher.

## The Importance of Jaw Crusher Calculation

Calculations are an essential part of designing a jaw crusher. They help determine the size and capacity of the crusher and ensure that it can handle the required amount of material. In addition, calculations can help optimize the crusher’s performance, ensuring that it operates efficiently and effectively.

One critical calculation in jaw crusher design is the nip angle, which refers to the angle between the jaws when the crusher is in operation. The nip angle affects the compressive force exerted on the material, the crushing efficiency, and the capacity of the crusher. A nip angle that is too large can cause the material to slip, leading to reduced crushing efficiency and lower capacity. On the other hand, a nip angle that is too small can cause the material to be squeezed, leading to excessive wear on the jaws and reduced capacity.

Another critical calculation is the size of the feed opening. The size of the feed opening determines the maximum size of the material that can be fed into the crusher. If the opening is too small, the material will not fit, leading to reduced capacity. If the opening is too large, the material will not be crushed efficiently, leading to increased wear on the jaws and reduced capacity.

### Calculating the Nip Angle

**The nip angle is calculated using the following formula:**

Nip Angle = Cos^-1 (r/R)

Where r is the radius of the crushing surface, and R is the distance between the stationary and moving jaw plates at the closest point of approach.

To determine the radius of the crushing surface, measure the distance from the pivot point of the jaw to the point where the material enters the crusher. This measurement should be taken perpendicular to the crushing surface.

To determine the distance between the stationary and moving jaw plates at the closest point of approach, measure the distance between the top of the stationary jaw plate and the bottom of the moving jaw plate at the point where the material enters the crusher.

Once you have these measurements, plug them into the formula to calculate the nip angle.

### Calculating the Size of the Feed Opening

The size of the feed opening is determined by the maximum size of the material that needs to be crushed. To calculate the size of the feed opening, follow these steps:

Measure the maximum size of the material that needs to be crushed.

Add a safety margin to the maximum size to account for variations in the material and ensure that the crusher can handle unexpected oversized pieces.

Determine the minimum opening required to allow the material to enter the crusher. This is typically done by using a formula or a graph provided by the crusher manufacturer.

Add a safety margin to the minimum opening to account for variations in the material and ensure that the crusher can handle unexpected oversized pieces.

Once you have these measurements, you can determine the size of the feed opening required for your jaw crusher.

### How do you calculate jaw crusher capacity?

Jaw crusher capacity can be calculated by using the formula: V = (L x W x H)/60 x (T/2) x (S/2.5), where V is the capacity in tons per hour, L is the width of the crusher opening (in inches), W is the width of the jaw (in inches), H is the height of the crusher opening (in inches), T is the tooth depth of the jaw die (in inches), and S is the set of the crusher (in inches).

### What is the capacity of jaw crusher per hour?

The capacity of a jaw crusher per hour can vary depending on the size and type of the jaw crusher, as well as the hardness of the material being crushed. Generally speaking, most jaw crushers can process around 1-3 tons per hour, with the more advanced models capable of processing over 5 tons per hour.

### What is the ratio of a jaw crusher?

The ratio of a jaw crusher refers to the size of the raw material that can be fed into the crusher compared to the size of the crushed material that is produced. For example, a jaw crusher with a ratio of 4:1 means that the raw material is four times larger than the size of the crushed material.

### What is the feed size of jaw crusher?

The feed size of a jaw crusher refers to the size of the raw material that can be fed into the crusher for processing. The maximum feed size of a jaw crusher is typically around 85% of the opening size of the jaw, or about 80% of the gap between the jaws.

**Jaw crusher manual pdf**

A jaw crusher manual in PDF format is a document that provides instructions and technical details for the installation, maintenance, and operation of a jaw crusher. These manuals can be useful for operators and maintenance personnel who need to perform routine tasks or troubleshoot issues with the crusher.

**Jaw crusher specification**

Jaw crusher specification refers to the technical details and performance characteristics of a jaw crusher. This can include information on the size and capacity of the crusher, the type of material it is designed to crush, the power requirements, and other technical details that may be important for users and operators.

**Jaw crusher size and capacity**

Jaw crusher size and capacity refer to the physical dimensions and maximum throughput of a jaw crusher. This can include information on the width and height of the crusher opening, the size and depth of the jaw die, and the maximum capacity in tons per hour that the crusher can process.

**Jaw crusher sizes**

Jaw crusher sizes refer to the physical dimensions of a jaw crusher, including the width and height of the crusher opening, the size and depth of the jaw die, and other dimensions that may be important for users and operators. Jaw crusher sizes can vary depending on the model and manufacturer.

**Jaw crusher working principle pdf**

Jaw crusher working principle in PDF format is a document that explains the operating principles of a jaw crusher. This can include information on the mechanism of crushing, the types of forces that are used to break down the material, and other technical details that may be important for users and operators.

**Jaw crusher construction**

Jaw crusher construction refers to the physical design and structure of a jaw crusher. This can include information on the materials used to construct the crusher, the overall weight and dimensions, and other details that may be important for users and operators. The construction of a jaw crusher can vary depending on the manufacturer and model.

### What is jaw crusher capacity and how is it calculated?

Jaw crusher capacity refers to the amount of material that a jaw crusher can process in a given time period. It is calculated using the formula: V = (L x W x H)/60 x (T/2) x (S/2.5), where V is the capacity in tons per hour, L is the width of the crusher opening, W is the width of the jaw, H is the height of the crusher opening, T is the tooth depth of the jaw die, and S is the set of the crusher.

### What is the maximum feed size for a jaw crusher?

The maximum feed size for a jaw crusher is typically around 85% of the opening size of the jaw, or about 80% of the gap between the jaws. It is important to ensure that the feed material is within the allowable range for the specific jaw crusher being used to avoid damage to the crusher or inefficient operation.

### How does the ratio of a jaw crusher affect its performance?

The ratio of a jaw crusher refers to the size of the raw material that can be fed into the crusher compared to the size of the crushed material that is produced. A higher ratio generally means that a larger raw material can be processed, which can result in higher throughput and efficiency. However, a higher ratio may also result in increased wear and tear on the crusher, as well as a reduction in the quality of the final product.

### What factors can affect the capacity of a jaw crusher?

The capacity of a jaw crusher can be affected by a number of factors, including the size and type of the jaw crusher, the hardness of the material being crushed, the speed and eccentric throw of the crusher, and the size distribution of the feed material. Other factors such as the type of feed chute and the size and shape of the crushing chamber can also have an impact on capacity.

### What are some common jaw crusher specifications?

Common jaw crusher specifications include the width and height of the crusher opening, the size and depth of the jaw die, the maximum feed size, the capacity in tons per hour, the power requirements, and the weight and dimensions of the crusher. Different models and manufacturers may have slightly different specifications depending on the intended application.

### What are some tips for maintaining a jaw crusher?

To maintain a jaw crusher, it is important to regularly inspect and replace worn parts such as the jaw dies, cheek plates, and toggle plate. Regular lubrication of the bearings and other moving parts can also help to prevent premature wear and extend the life of the crusher. It is also important to follow the manufacturer’s recommended maintenance schedule and to use the crusher only for its intended purpose.

## Conclusion:

Calculations are a critical part of designing a jaw crusher. They help determine the size and capacity of the crusher and ensure that it operates efficiently and effectively. Two critical calculations in jaw crusher design are the nip angle and the size of the feed opening. The nip angle affects the compressive force exerted on the material, the crushing efficiency, and the.